The double-deficit theory of reading disabilities (RD) was examined in 56 children with reading disabilities and 45 controls (ages 8-11). Students differed on all phonological analysis tasks and rapid naming of digits and letters, but also differed on orthographic tasks, attention ratings, arithmetic achievement, and all WISC-III factors except perceptual organization, thereby supporting a multiple causality theory of RD. (Contains references.) (Author/CR)